The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1987
Filed:
Dec. 23, 1985
Martin Greppmair, Munich, DE;
Wacker Werke GmbH & Co. KG, Munich, DE;
Abstract
A motor-driven hammer having an impact mechanism that is driven by the motor via a crank drive. The hammer has a protective cover that is provided with handgrips and is cushioned relative to the housing of the hammer. When viewed in the upright position of operation of the hammer, the cover is spaced from, and covers, the top, both sides, and the front of the motor and crank drive, at least relative to an operator. Two pairs of swing arms extend on both sides between the housing and the cover for positively guiding the cover parallel to the longitudinal axis of the hammer. The swing arms of a given pair of arms are disposed parallel to one another, and are spaced apart one above the other. Each arm has two ends, one of which is pivotably mounted on the cover, and the other of which is pivotably mounted on the housing. This pivotable mounting is effected by pivot mechanisms, at least some of which are embodied in the form of soft torsion springs. The swing arms have a pivot range that is free except for the torsion spring effect. Stops are provided for elastically delimiting the free pivot range of the arms. These stops cooperate in a cushioned manner and are disposed on the housing and on the cover. The stops have a spring force that increases progressively outwardly from the free pivot range of the swing arms.